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.\" $Id: tabs.1,v 1.2 2008/11/15 23:03:45 tom Exp $
.TH @TABS@ 1M ""
.ds n 5
.SH NAME
\fBtabs\fR - set tabs on a terminal
.SH SYNOPSIS
\fBtabs\fR [\fB-v\fR[\fIn\fR]] [\fB-ahuUV\fR] \fIfile...\fR
.br
.SH DESCRIPTION
.PP
The \fBtabs\fP program clears and sets tab-stops on the terminal.
This uses the terminfo \fIclear_all_tabs\fP and \fIset_tab\fP capabilities.
If either is absent, \fBtabs\fP is unable to clear/set tab-stops.
The terminal should be configured to use hard tabs, e.g.,
.sp
.RS
stty tab0
.RE
.SH OPTIONS
.SS General Options
.TP 5
.BI -T "name"
Tell \fBtabs\fP which terminal type to use.
If this option is not given, \fBtabs\fP will use the \fB$TERM\fP
environment variable.
If that is not set, it will use the \fIansi+tabs\fP entry.
.TP 5
.B -d
The debugging option shows a ruler line, followed by two data lines.
The first data line shows the expected tab-stops marked with asterisks.
The second data line shows the actual tab-stops, marked with asterisks.
.TP 5
.B -n
This option tells \fBtabs\fP to check the options and run any debugging
option, but not to modify the terminal settings.
.PP
The \fBtabs\fP program processes a single list of tab stops.
The last option to be processed which defines a list is the one that
determines the list to be processed.
.SS Implicit Lists
Use a single number as an option, e.g., "\fB-5\fP" to set tabs at the given
interval (in this case 1, 6, 11, 16, 21, etc.).  Tabs are repeated up to
the right margin of the screen.
.SS Explicit Lists
An explicit list can be defined after the options (this does not use a "-").
The values in the list must be in increasing numeric order, and greater than
zero.  They are separated by a comma or a blank, for example,
.sp
.RS
tabs 1,6,11,16,21
.br
tabs 1 6 11 16 21
.RE
Use a '+' to treat a number as an increment relative to the previous value,
e.g.,
.sp
.RS
tabs 1,+5,+5,+5,+5
.RE
which is equivalent to the 1,6,11,16,21 example.
.SS Predefined Tab-Stops
X/Open defines several predefined lists of tab stops.
.TP 5
.B -a
Assembler, IBM S/370, first format
.TP 5
.B -a2
Assembler, IBM S/370, second format
.TP 5
.B -c
COBOL, normal format
.TP 5
.B -c2
COBOL compact format
.TP 5
.B -c3
COBOL compact format extended
.TP 5
.B -f
FORTRAN
.TP 5
.B -p
PL/I
.TP 5
.B -s
SNOBOL
.TP 5
.B -u
UNIVAC 1100 Assembler
.SH PORTABILITY
.PP
X/Open describes a \fB+m\fP option, to set a terminal's left-margin.
None of the entries in the terminal database provide this capability.
.PP
The \fB-d\fP (debug) and \fB-n\fP (no-op) options are extensions not provided
by other implementations.
.PP
Documentation for other implementations states that there is a limit on the
number of tab stops.  While some terminals may not accept an arbitrary number
of tab stops, this implementation will attempt to set tab stops up to the
right margin of the screen, if the given list happens to be that long.
.SH SEE ALSO
\fB@TSET@\fR(1),
\fB@INFOCMP@\fR(1M),
\fBcurses\fR(3X),
\fBterminfo\fR(\*n).
.PP
This describes \fBncurses\fR
version @NCURSES_MAJOR@.@NCURSES_MINOR@ (patch @NCURSES_PATCH@).
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